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JWST Reveals a Possible z ∼ 11 Galaxy Merger in Triply Lensed MACS0647–JD
Finkelstein, Steven L.; Hutchison, Taylor A.; Larson, Rebecca L. +63 more
MACS0647–JD is a triply lensed z ∼ 11 galaxy originally discovered with the Hubble Space Telescope. The three lensed images are magnified by factors of ∼8, 5, and 2 to AB mag 25.1, 25.6, and 26.6 at 3.5 µm. The brightest is over a magnitude brighter than other galaxies recently discovered at similar redshifts z > 10 with JWST. Here, we re…
A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of z > 6.5 Quasars Using JWST
Hennawi, Joseph F.; Shen, Yue; Strauss, Michael A. +53 more
Studies of rest-frame optical emission in quasars at z > 6 have historically been limited by the wavelengths accessible by ground-based telescopes. The James Webb Space Telescope (JWST) now offers the opportunity to probe this emission deep into the reionization epoch. We report the observations of eight quasars at z > 6.5 using the JWST/NIR…
Double Trouble: Two Transits of the Super-Earth GJ 1132 b Observed with JWST NIRSpec G395H
Sing, David K.; Lustig-Yaeger, Jacob; Fu, Guangwei +19 more
The search for rocky planet atmospheres with JWST has focused on planets transiting M dwarfs. Such planets have favorable planet-to-star size ratios, enhancing the amplitude of atmospheric features. Since the expected signal strength of atmospheric features is similar to the single-transit performance of JWST, multiple observations are required to…
ALMA confirmation of an obscured hyperluminous radio-loud AGN at z = 6.853 associated with a dusty starburst in the 1.5 deg2 COSMOS field
Fan, Xiaohui; Stark, Daniel P.; Endsley, Ryan +7 more
We present band 6 ALMA observations of a heavily obscured radio-loud (L1.4 GHz = 1025.4 W Hz-1) active galactic nucleus (AGN) candidate at zphot = 6.83 ± 0.06 found in the 1.5 deg2 COSMOS field. The ALMA data reveal detections of exceptionally strong [C II]158 $\mu$m (z[C II] = 6.85…
The abundance of z ≳ 10 galaxy candidates in the HUDF using deep JWST NIRCam medium-band imaging
Cullen, F.; McLure, R. J.; Dunlop, J. S. +4 more
We utilize JWST NIRCam medium-band imaging to search for extreme redshift (z ≥ 9.5) galaxy candidates in the Hubble ultra deep field (HUDF) and the additional pointing within the GOODS-South field provided by the second NIRCam module. Our search reveals six robust candidates, three of which have recently been spectroscopically confirmed. One of th…
MIDIS: Strong (Hβ+[O III]) and Hα Emitters at Redshift z ≃ 7-8 Unveiled with JWST NIRCam and MIRI Imaging in the Hubble eXtreme Deep Field
Ilbert, O.; Östlin, G.; Güdel, M. +44 more
We make use of JWST medium-band and broadband NIRCam imaging, along with ultradeep MIRI 5.6 µm imaging, in the Hubble eXtreme Deep Field to identify prominent line emitters at z ≃ 7-8. Out of a total of 58 galaxies at z ≃ 7-8, we find 18 robust candidates (≃31%) for (Hβ + [O III]) emitters, based on their enhanced fluxes in the F430M and F44…
Scaling laws for the energy transfer in space plasma turbulence
Sorriso-Valvo, Luca; Marino, Raffaele
One characteristic trait of space plasmas is the multi-scale dynamics resulting from non-linear transfers and conversions of various forms of energy. Routinely evidenced in a range from the large-scale solar structures down to the characteristic scales of ions and electrons, turbulence is a major cross-scale energy transfer mechanism in space plas…
STRIDES: automated uniform models for 30 quadruply imaged quasars
Bacon, D.; Smith, M.; Annis, J. +69 more
Gravitational time delays provide a powerful one-step measurement of H0, independent of all other probes. One key ingredient in time-delay cosmography are high-accuracy lens models. Those are currently expensive to obtain, both, in terms of computing and investigator time (105-106 CPU hours and ~0.5-1 yr, respectiv…
Detection of Atmospheric Escape from Four Young Mini-Neptunes
Knutson, Heather A.; Ricker, George R.; Dai, Fei +5 more
We use Keck/NIRSPEC to survey a sample of of young (<1 Gyr), short-period mini-Neptunes orbiting nearby K dwarfs to measure their mass loss via the metastable helium line. We detect helium absorption from all four of the targets in our initial sample. The first detection, around TOI 560b, was announced in a previous paper. We now announce three…
Methane throughout the atmosphere of the warm exoplanet WASP-80b
Fortney, Jonathan J.; Boyer, Martha L.; Bell, Taylor J. +12 more
The abundances of main carbon- and oxygen-bearing gases in the atmospheres of giant exoplanets provide insights into atmospheric chemistry and planet formation processes1,2. Thermochemistry suggests that methane (CH4) should be the dominant carbon-bearing species below about 1,000 K over a range of plausible atmospheric compo…